Piezoelectric power generation of vertically aligned lead-free (K,Na)NbO3 nanorod arrays
- 등재 SCIE, SCOPUS
- 발행기관 Royal Society of Chemistry
- 발행년도 2014
- 총서유형 Journal
- URI http://www.dcollection.net/handler/ewha/000000098570
- 본문언어 영어
- Published As http://dx.doi.org/10.1039/c4ra02921f
- 저작권 이화여자대학교 논문은 저작권에 의해 보호받습니다.
초록/요약
We report piezoelectric power generation at room temperature, as well as at elevated temperature, using vertically aligned lead-free (K,Na)NbO3 nanorod arrays on a conducting substrate. Ferroelectric (K0.6Na 0.4)NbO3 nanorod arrays having a high piezoelectric coefficient of ca. 180 pm V-1 were epitaxially grown on a conducting SrRuO3/SrTiO3 substrate via the facile hydrothermal method at low temperature (ca. 190 °C). After electric poling, the (K,Na)NbO 3 nanorod array-based nanogenerator generated a stable high power density of ∼101 μW cm-3 at 20 °C, almost 16 times greater than a BaTiO3 nanowire-based vibrational energy harvester (ca. 6.27 μW cm-3). The (K,Na)NbO3 nanorod array-based nanogenerator exhibited little frequency dependence on external force over a relatively low-frequency range (≤10 Hz) and showed long-term durability even at 100 °C, with a power density of 29 μW cm-3. This work demonstrates the potential of eco-friendly nanogenerators based on (K,Na)NbO3 nanorod arrays for high-output power generation under various environmental conditions. © 2014 The Royal Society of Chemistry.
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